# Door Control

A project to interface an electronic door lock actuator by Abus with a PC using
an Adafruit Feather STM32F405 Express.

## Goals

- USB-serial converter @ 115200 baud to pass through commands to an external
  NXP532 NFC controller. This will be used to authenticate people who want to
  open the door.
- Readout of the current door state. This is done by connecting to the two
  outputs of the rotary encoder and integrating the changes.
- Opening and closing the door by simulating presses of two buttons.

## Wiring

TODO. Add pictures and stuff.

## Communication

Endpoint 3 is the serial bridge to the NFC controller and should show up as e.g.
/dev/serial/by-id/usb-Imaginaerraum.de_DoorControl_433632201350535727003F0-if03
(depending on the ID of the STM32F405).

Endpoint 1 is another serial interface and used for all other functions.

Command characters:
- 'B': Print the battery voltage
- 'C': Closes the door
- 'O': Opens the door
- 'R': Print the encoder position

Currently, a change in the encoder value will be communicated immediately, as
"pos: %d\r\n", the same format returned by the 'R' command.